(405) Method Not Allowed

Hello,
when I try click the "Provision the application" button, I obtained following message "The remote server returned an error: (405) Method Not Allowed.". See in the picturre for details
http://source.php5.cz/error.jpg. Can you help me please?
Best regard,
Martin
I filled next information:
Legal name: Contoso LLC
Alias: contoso
Domain model: small
Admin Password: qwe;098x
Confirm Password: qwe;098x